Activation of human endogenous retrovirus K (HERV-K) and cellular modifications in human melanoma cell line: transcriptional profiling analysis by Moroni Gabriella, Pierimarchi Pasquale, Serafino Annalucia, Al Dossary Reem, Sorrentino Roberta, Matteucci Claudia, Balestrieri Emanuela, Garaci Enrico, Vallebona Paola